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makes begin< int_<0> >::type compile

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[SVN r33978]
This commit is contained in:
Tobias Schwinger
2006-05-16 13:35:43 +00:00
parent 19ffdaaad4
commit fef0cb1b3c
1 changed files with 22 additions and 2 deletions
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24
include/boost/mpl/aux_/begin_end_impl.hpp
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@@ -17,12 +17,30 @@
#include <boost/mpl/begin_end_fwd.hpp> #include <boost/mpl/begin_end_fwd.hpp>
#include <boost/mpl/sequence_tag_fwd.hpp> #include <boost/mpl/sequence_tag_fwd.hpp>
#include <boost/mpl/void.hpp> #include <boost/mpl/void.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/aux_/has_begin.hpp>
#include <boost/mpl/aux_/na.hpp> #include <boost/mpl/aux_/na.hpp>
#include <boost/mpl/aux_/traits_lambda_spec.hpp> #include <boost/mpl/aux_/traits_lambda_spec.hpp>
#include <boost/mpl/aux_/config/eti.hpp> #include <boost/mpl/aux_/config/eti.hpp>
namespace boost { namespace mpl { namespace boost { namespace mpl {
namespace aux {
template< typename Sequence >
struct begin_type
{
typedef typename Sequence::begin type;
};
template< typename Sequence >
struct end_type
{
typedef typename Sequence::end type;
};
}
// default implementation; conrete sequences might override it by // default implementation; conrete sequences might override it by
// specializing either the 'begin_impl/end_impl' or the primary // specializing either the 'begin_impl/end_impl' or the primary
// 'begin/end' templates // 'begin/end' templates
@@ -32,7 +50,8 @@ struct begin_impl
{ {
template< typename Sequence > struct apply template< typename Sequence > struct apply
{ {
typedef typename Sequence::begin type; typedef typename eval_if<aux::has_begin<Sequence, true_>,
aux::begin_type<Sequence>, void_>::type type;
}; };
}; };
@@ -41,7 +60,8 @@ struct end_impl
{ {
template< typename Sequence > struct apply template< typename Sequence > struct apply
{ {
typedef typename Sequence::end type; typedef typename eval_if<aux::has_begin<Sequence, true_>,
aux::end_type<Sequence>, void_>::type type;
}; };
}; };